The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 function test() {

   let {Rect} = Components.utils.import("resource:///modules/tabview/utils.jsm", {});

   let referenceRect = new Rect(50,50,150,150);

   let rect = new Rect(100,100,100,100);

   ok(referenceRect.contains(referenceRect), "A rect contains itself");

   ok(referenceRect.contains(rect), "[50,50,150,150] contains [100,100,100,100]");

   rect.inset(-1,-1);

   ok(!referenceRect.contains(rect), "Now it grew and [50,50,150,150] doesn't contain [99,99,102,102]");

 }